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Share-Based Compensation - Summary of Restricted Stock and Performance Units Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restricted Stock      
Restricted Stock and Performance Units [Roll Forward]      
Outstanding at January 1 739,732 786,079 1,007,794
Granted 173,144 173,199 242,835
Vested [1] (165,547) (213,992) (443,627)
Forfeitures (3,738) (5,554) (20,923)
Outstanding at December 31 743,591 739,732 786,079
Restricted Stock and Performance Units (Weighted Average Grant-date Fair Value) [Abstract]      
Weighted Average Grant-Date Fair Value, Outstanding at January 1 $ 77.23 $ 63.44 $ 49.47
Weighted Average Grant-Date Fair Value, Granted 114.63 107.57 67.48
Weighted Average Grant-Date Fair Value, Vested [1] 72.84 51.37 34.11
Weighted Average Grant-Date Fair Value, Forfeitures 78.66 69.03 59.63
Weighted Average Grant-Date Fair Value, Outstanding at December 31 $ 86.90 $ 77.23 $ 63.44
Performance Units      
Restricted Stock and Performance Units [Roll Forward]      
Outstanding at January 1 226,558 232,088 175,675
Granted 83,515 53,070 77,017
Vested [2] (43,369) (58,600) (20,604)
Outstanding at December 31 266,704 226,558 232,088
Restricted Stock and Performance Units (Weighted Average Grant-date Fair Value) [Abstract]      
Weighted Average Grant-Date Fair Value, Outstanding at January 1 $ 77.07 $ 62.68 $ 59.94
Weighted Average Grant-Date Fair Value, Granted 115.35 108.19 67.57
Weighted Average Grant-Date Fair Value, Vested [2] 71.19 56.08 57.58
Weighted Average Grant-Date Fair Value, Outstanding at December 31 $ 90.01 $ 77.07 $ 62.68
[1] The total fair value of awards upon vesting for the years ended December 31, 2018, 2017, and 2016 was $18.9 million, $23.3 million, and $28.8 million, respectively.
[2] The total fair value of awards upon vesting for the years ended December 31, 2018, 2017, and 2016 was $5.4 million, $7.5 million, and $1.1 million, respectively. Upon vesting of the awards in 2018, 2017, and 2016, PCA issued 46,876 shares, 67,391 shares, and 21,111 shares, respectively. For 2018, 2017, and 2016, these amounts included 3,507 shares, 8,791 shares, and 507 shares, respectively, for dividends accrued during the vesting period.